Improvement in sewing-machines



L. als'woLn.

Sewing-Machines. No. 146,761. Parenredlamzmam.

2Sheetsf-Sheetf2. L. alswoLn. A Sewing-.Machines.

Patented Jan. 27,1874.

VvNITED STATES' LEO GRISWOLI), OF NEW YORK, N. Y.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 146,761, dated January27, 1874 application filed v June 21, 1873. t

To all whom it may concern:

Be it known that I, LEO GnrswoLD, of the city,'county, and State of NewYork, have invented certain Improvements in Sewing-Machines; ,and I dohereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanying drawin gs, making apart of this specification.

The` nature of my invention consists, first, in the peculiarconstruction and arrangement of the driving-gear, a horizontaldriving-shaft,

and a' vertical transmitting-shaft, having a rawhide pinion and aily-wheel thereon, and formed with a crank; second, in the shuttlecaseprovided with a detached race on which the shuttle moves, and which isprovided with a single adjusting screw, all substantially as hereinafterset forth.

In the accompanying drawings, Figure l is a side elevation of asewing-machine constructed with my improvements; Fig. 2, a sideelevation thereof, looking in the opposite direction; Fig. 3, a centralvertical section of the case which bears the needle and presserbars,showing the said bars in elevation; Fig. 4, a partial section,corresponding with the view in Fig. 3, but showing the take-up77 devicein a different position; Fig. 5,a view of a portion of the verticaltransmitting-shaft, showing its pinion, crank, and left-handed screw`andnut; Fig. 6, a view in perspective of the doubly-adjustablecloth-feeding device; Fig. 7, a vertical section across the shuttlecaseand race, showing also the cloth-feeding.

\ device; Fig. 8, a top view of the shnttle-case;

Fig. 9, a top view of 'the shuttle; Fig. 10, a partial longitudinal`section of the same; Fig. 1 l, a view of the driving-treadle, showingits arrangement on a curved shaft. l

Like letters designate corresponding parts in all of the iigures. y

A represents the cloth-plate on which the `working parts are mounted; B,the needle and presser-plate arm; C, the needle-bar; D, the ,f

presser-bar E, the vertical transmitting-,f shaft; F, the bearing-casefor the needle andi presser-bars G, a bracket beneath the clothplate, tosupport the driving-shaft and gear; H, the takenp device composed of aspringdisk, I, and laterally-vibrating pin K, opera- `Lin g inconnection with the camrecess L in the needle-bar; M, an adjustablecollar on the presser-bar, to adjust` the force `of the pressing-springN, the raw-hide pinion on the transmittingshaft E; O, the beveldrivinggear, matching into the pinion N, and provided with a crank-pinto receive a connecting-rod, O2, which extends up from the treadle b,with its downwardly-curved shaft c,- P, a crank on thetransmitting-shaft E, for operating the shuttle; Q, a left-handed screw,and It the nut upon the said screw; S, a steel step, or journal, on thelower end of the vertical shaft E; T, a hard-steel collaron the shaftabove the journal to sustain the shaft and make it run light and withbut little wear; V, a cam on the transmitting-shaft for operating theneedle-bar; W, a iy-wheel situated on the upper end of the verticalIshaft E; X, the horizontal driving-shaft; Y, the shuttle; Z, aswinging-bar or plate in the shuttle, provided wi th a spring, a, andadj listing-screw a2, for holding the bobbin in the shuttle andregulating the -t-ension of the bobbin-thread. The horizontaldriving-shaft X, by having a crank-pin on its drivin g-gear wheelO,`receives the power from the treadle without additional parts, and thesaid bevel drivinggear wheel transfers the power to the verticaltransmitting-shaft E, which, being partly below and partly above theclotlrplate A, is in the best possible position for transmitting motionto the needle as well as to the shuttle and the cloth-feeding device.The rawhide pinion N renders the mot-ion of the driving and transmittingdevices nearly noiseless. The left'handed screw Q and nut It areeii'ectually prevented from unscrewing by the revolving motion of theshaft E` being in the opposite direction and tending rather to tightenthan to unscrew them. The ily-wheel W is upon the transmitting-shaft E,which revolves faster than the driving-shaft X, and may be made lighterand smaller, with equal effect, than if it revolved more slowly.

The needle-bar, shuttle, and clo th-feedingde vices are all operateddirectly from the'trans mittingshaft E. The shuttle-case f, in which theshuttle-driver g slides, has a separate or detached race on which theshuttle moves. The case is so made as to hohl this detached race inposition and allow it to be adjusted up and down therein. A singlescrew, h, passing up through the bottom ofthe case, adjusts the race tothe height required.

That I claim as lny invention7 and desire to secure by Letters Patent,is-

1. The combination with the drivin g-gear O, on the horizontaldrivin'gshaft X, and e crankpin for the reception of the treadle-rod O2,of the Vertical stepped transmittingshaft E, provided With the rawhidepinion N5 and crank and cam for operating the shuttle carrier-rod andneedle-lever, and with u y-Wheel, W, 011

its upper end, all constructed and arranged substantially as and for thepurpose herein specified.

2. The Combination of the shuttle-case f with its detached race on whichthe shuttle moves,

and the single adjusting-screw h, substantially as and for the purposeherein specified.

LEO GRISWOLD.

Witnesses:

ARTHUR NEILL, ABRAHAM LEVY.

